If the widget people give you some code, you can put it in a text widget, but not all codes work here. Some are stripped out for security purposes. Try it, putting a text widget in your sidebar, adding a title, pasting in the code, and then see if it shows and works on the front of the blog.

If it doesn't work, come back and paste it here, between backticks (usually same key as the ~) so it displays and we can tell if we can fix it to work.